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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2123fb839ff1e9ddd674711ad7e5505959f030462d3286eca0591c96141c3d93' 
  AND token = 'FhbJHowAvd+bhQnDoRjQtjLGlD0DMDb1ILSVvVAevLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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