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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2962035c9cc596b6f1b152866120a39d09c533843dc0034a29b144ee187a26' 
  AND token = 'G35IHsXcJ2KF3+qCbTuu1gJSVktNWrEYGl1bBI8c6GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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