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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff644329a5b8e45732365ea0adca3f72f068c2a9de09b8d76a960db147cfd4a6' 
  AND token = 'BzjAefIQSC4s4u5BxNhH+ypcnIPM/ktTZPma6WgVOkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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