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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692e754f332733861b67d11e53bc00de331bcda84b5f036a8e801659c49b18c9' 
  AND token = 'D1whkmv07P4Dv9AFjbo3a1PZkRh7BeBW96iTMvWRuIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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