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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8be48f9d664e8eae52fac5f339e4a1cafbd5c348a2b7b4a724a4ea4bc4e91c' 
  AND token = 'aKbwNhrIkOyqbFtr6uM4WsBnd+MCdw4huwH4+CXseHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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