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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a7c125167754f94de7e67e22c6e2d4de75df282f0cef68feea0fb93c24476e' 
  AND token = 'OP5eqCG25jR2T6lIrVcnSx4ujEYiAG/9myQze/x1OcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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