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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719efa58ffe2ce09e835779342b4b247970b2520297a0f6f69d60ae2ea30155e' 
  AND token = 'pIAX2/mUzFlm6dHAdoSk+E1Hh4y66skviL09cb+xOho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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