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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44813cafece4e7feec270b1e4461aa76e7d039c194ca3d30dd78a603c16f4fb1' 
  AND token = '/g0UmggdzBSIQJXFJ6BSu2TMDck/Cm4YvAX5K0IKevs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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