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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f29457a1ab68466c4b7d04102726be7d6dae2ea4aa089dfaf081be030bda63' 
  AND token = 'kdY0rdoxWBpQMLbw/3IrkqPSIkOrhFRNjEyX/D05xYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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