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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1993e5d1c9f68bd4803fe4a5499b01cf1e17eedc6e25b8e99690cf2b3230dfe7' 
  AND token = 'FBJJQEqhl4USS2bLWTaIiEkUvdJD02T8vVw4gfUMMUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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