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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae833fe56025cb23144625e79325a74374f37f48c69bc39264c1d585439ec5e' 
  AND token = 'jyBsIOmb/lWPBeErgGecxUpy59lgH+90t72FLH/TS6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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