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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a0b8b9952a6187b71775e152f84ef54b2c11a5eca92b95f02d5d8b277ca1d2' 
  AND token = 'GdM84LQyry3EqoQGwyw4JI497K13A7+5Hmk6QpZtIDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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