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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1593eb0a2c55b44a1c3037ba127acb3f92329ef19cf25e4af45844b1dd6fb77' 
  AND token = '1jGwZAEl1Ys1N4lPTVv0myO43uvKkEEZUqtu6SMkFWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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