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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7006e2b28a0b5b24f5ac5f96e067ecd5b80c2fe5ec63dd1d733e22fe275584b' 
  AND token = '3dBse+gDo3UbTmpMTLWWiTFgI1qMMTEBUpWf5ki1hHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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