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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7207ae8cc108431b27f52cddf5f6af0860740c637296fea647960046b0a4aa' 
  AND token = 'clqFCSdYPN5l7xf0R/ONW9H0fL7YQClWsg9gpU09gW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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