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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d881ec93bba6747df1b5638191a6711b1a13e46d93e0351c81e132acc05029' 
  AND token = 'Frrgv7e4VTDuKlkNJCn8tvk82KOvCzvp2cP6hlGQt80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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