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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd412ce2914494729677c2774794605d26c416b66246530140a20d18041d2a6b0' 
  AND token = 'f+5c8mLOZqxuUY534buU4/ZWlUWvK4/+yvdCNGTF/Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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