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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20684febb6e9071f247c790bbe5f85c7d5883f903061deede624d96858ac3f69' 
  AND token = 'CpRK7evtYqtaEvzdDe826MnOtFMC9l3wN1aN1GNrKI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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