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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9788ab59ce5e61870398c515c61adead2c66e032120024705976746315ebc356' 
  AND token = 'eGrHLU0IKiiBSSyCSblZ+fWQ+3hMJyBP6nwiqrApz4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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