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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6762126390894b8811b6e965e2e6b205fbaa2cffe11e506caec2046d71e27eb7' 
  AND token = 'qLUrJb6x6oyUlOVSKxKMewpE7IK8SQVltT7uXNsIs9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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