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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3082213ae7bdd8bd44030904b9d4c360cff2680d0e3a403c0bcd2c7a32095f18' 
  AND token = 'av+1+1QLBare2Y1gQNQowk+r7yjwhPwnlAaKatTA9f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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