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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca4a4425e1b7bc543beffe3b2db8185b6d473c428f5cf7a51a0f769813c7979' 
  AND token = 'YxF5CL/HMNcgqP0rF+s/OIhDlcMF2EGlho9MC5+ELwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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