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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b134f3be1544ebfdf732ecdc92975e3a1c43d2e7d2384f38367ec712c976898b' 
  AND token = 'gDTg8URxToy0+mrhNPhtMe+xYfvij3Wq2QLzgIvkdqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}