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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57362ad96baf5e9ac8803e59116f75a21ca9a0604f5a112ec5d0c7434705352' 
  AND token = '9cQgegL3r91ek64FZxGiG7R1dDadtk6fi/wd3EzSx6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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