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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1dd89e99ba5b889651b4bc47c3730be7475a64666d6fb6ab554c2874c2782f' 
  AND token = 'SuzqVrcBqNAM+9WDR2KD+ONvSmmMVsrR3/smfYOEQek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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