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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c027e1747a48eaa167b5c9d088e7ca5970abf823580bd24bdb1c726c497bab4' 
  AND token = 'h0SmHvPyw+bTywVpkT1Xo4rR5vtu+35GeHnJLW7qcwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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