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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bec6aa76a9b859f6437976a3e31b59c120aed2f35bc8cd64cf8d0f2c869576b' 
  AND token = 'jShRXrohX6krJpotpVaz3/odVXJzN03iIfzFGxMrkoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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