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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e7da60a12f1d18337c44cc1ed43d3b7877fdd732a4f7ac117272165d6b0827' 
  AND token = 'cooByC98wNth/Pg1nQcq2YPgFPKPQOkxCO6Vf0NgHgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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