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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ca32998745dad9df4243423e67e244598830c4ad767f32e41cb6b0b2604f6e' 
  AND token = 'dVa+9mPGxJ+ePjnMzo+Tpx4w8w+XV9zZxEjZg0MN0FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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