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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cd709707d81d594b612fa6921aa649d0af0d9d0915528691c1e2094553f2e9' 
  AND token = 'gxR0fxnj2P7ivWu0H/Cj1+OkFQBb0w5kD1y4uHISDpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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