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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba00868e3d3f47bbeaeb712de46eb819de08430bdfdc47734013bcd79ba1b692' 
  AND token = '+9feaM25EGyFY0T07tro7+1vSolEA1h2SBfQYJwLXBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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