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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebbea4931946fa3e6f2d6f79b6f16edcf0a5db398e2154de3b9791e2e41d45a' 
  AND token = 'N+asvUdTeZBMP6JP0M/f6MnB1wHHVoJ5DMBR2vYROBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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