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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcc7edb569a8dc1e631cce0a41ce7d7b1f0f76bba0c61890b61305eee8f0824' 
  AND token = 'gFL4azj6mcqORnjKLOrO7pGj8ux5dNL+LVCahTupdQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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