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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44f6190237a16d6225aac9ceaf910d6b761a7139a2a680c253481b177296041' 
  AND token = 'JyxmdSjDWlKzaggeMObyXPavfDuxkdkAnjOwF+KawtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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