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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ac741bb60c4c66151561d4d199a1de1f6828be810e6772a832b783f9ac1749' 
  AND token = 'T2FZkOTRQH4FKNmMKjFjdpLpPAxwF8OvNLBLUpYoxD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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