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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab74f6fc370fe3b64129396dfc89f3483c603d28f48ba04e0b1faee4e7e84a2' 
  AND token = '92jdsisCEH4ASsDMQsP8zBkoqdvGFo16i45rEGiaMLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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