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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf2890648a42efb59a3d441899ae0d2c19031e602c57380719587fc2f1972fb' 
  AND token = 'OT7cEvBnEX4z3R7lZhZeEBQyfr8ab1rkELueheW8iqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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