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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d93a83468e601a2870e455dcef759e5584e8c3f3c639609078a36cf021300cf' 
  AND token = '2uOhWRaTIxjHlevOTM71rhl7OKgDi8cRxEAucWad2Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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