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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8514c9ca61dabf2c3f67c48ec8c1c49cf15914fe2676550b22b1cf2ecbf50e' 
  AND token = 'eCTpJfUn1UiYb/6cutJOUqqakCOtZkWFeQHR4xoxSOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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