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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e899820fb4751503e1fb775d1ed6db0a0948392301d4355a34b8453e6cf12659' 
  AND token = 'ooFNOpFTH/tdyGk6QX36InzzTp1seo/p1NhmjFaEJ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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