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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06ee735114c89e33e7e5f5244201836d66de9f309f33e28be816b7ceaaa630b' 
  AND token = 'SiGWgszcL+wObSCKJgNJqUhOX12CFAKw0B5SG0anc2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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