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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7510f22a0ebef3dadeb8f3c9c6753465608b1cd507b8d17f8ae81937c92d76d3' 
  AND token = 'TDLRwPeITRbtLzS1eSb49Pd15fQ6yfbhbLq1GqBvJyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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