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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ab54d9ea4b7345d57398c3320083d28e53cdd03a7f935884a6a54d50e7c28d' 
  AND token = 'b+Sbt6bKXW/CQV2AGIhjapdx5RhTWdgyIZtVR7/Pfq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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