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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059581be05afac937dea8c40cbe69b5e6cc43a2ef3c6a6fa873b7cd3db5cd3d1' 
  AND token = 'r9OkjsJBu5p3wxJ1mVNUJ73b4bLSKI2bsGuRZd6q5dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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