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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75278628b1675d4f1fe4116ef929ee0a20ced26d2866798c3e2b0ee2ed2b5beb' 
  AND token = 'NTYEeAERHjlpUlc6PWlTzItCZKwgnGcuKTdR2QMnhoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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