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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923d52cd28cdb0cb5f75e92b8dee68fa7f7cf2f8ca2f3371c0e0118afaaf3119' 
  AND token = '6vGL8h2r4sp+wcSCQRQAP/kAOPXsBk/aQBJ024XSSd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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