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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b569d847377d5c6d0ab9fc83d1aba30372623ee2caf90bc2106030a490db5d' 
  AND token = 'ieFtrgNM2efG4SIDN9AQY5likfvTbA/nSsI/MFl/Qb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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