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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e6a27eadd086ed46c7191b3c6025ce8545d71a1975a9958572796e7cc304d9' 
  AND token = '3U8TvsSM0wM3MalQFBqlwNxbHU1ASq+5q82nnxX/a70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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